The Effect of Cross-linking Technique on Membrane Performance for Direct Methanol Alkaline Fuel Cell Application

Yıl 2019, Cilt: 23 Sayı: 3, 709 - 716, 25.12.2019

Gülşen Albayrak Arı Coşkun Gülen

https://doi.org/10.19113/sdufenbed.529398

Cited By: 1

Öz

In this
study, anion exchange membranes (AEM) based on poly(vinyl alcohol) (PVA) were
prepared by two different cross-linking techniques and the effects of application
sequence of thermal and chemical cross-linking technique on properties of AEM
were investigated. Poly(ethylene glycol) diglycidly ether (PEGDGE) was used as
a chemical cross-linking agent instead of the commonly used glutaraldehyde (GA).
Evaluation of the fuel cell-related properties of the prepared membranes showed
that the technique of cross-linking and the application sequence of techniques
affected the properties of membranes. Promisingly, it was found that the
membranes prepared by firstly chemical cross-linking and then thermal
cross-linking at 150˚C (PPP150) exhibited high ionic conductivity (47 mS/cm),
membrane selectivity values (89 x10⁴ S.s/cm³) and
sufficient mechanical strength. These encouraging results indicate that
AEMs-based on PVA cross-linked by chemical technique with PEGDGE and then
thermal technique may be considered as a promising membrane for Direct Methanol
Alkaline Fuel Cell (DMFC) applications.

Anahtar Kelimeler

Fuel cell, Poly(vinyl alcohol), Crosslinking

Doğrudan Metanol Alkali Yakıt Hücresi Uygulamaları İçin Çapraz Bağlama Yönteminin Membran Performansı Üzerine Etkisi

Öz

Bu
çalışmada poli (vinil alkol) (PVA) esaslı anyon değişim membranlar (AEM) iki
farklı çapraz bağlama tekniği ile hazırlanmış ve ısıl ve kimyasal çapraz
bağlama tekniklerinin uygulanma sırasının AEM’ın özellikleri üzerine etkisi incelenmiştir.
Kimyasal çapraz bağlayıcı olarak en çok kullanılmakta olan glutaraldehit (GA)
yerine poli(etilen glikol) diglisidil eter (PEGDGE) kullanılmıştır. Hazırlanan
membranların yakıt hücresi ile ilgili özellikleri değerlendirildiğinde, çapraz
bağlama tekniğinin ve farklı tekniklerin uygulama sırasının membranın
özelliklerini etkilediği görülmüştür. Önce kimyasal sonra 150˚C’de ısıl çapraz
bağlama uygulanarak hazırlanan membranın (PPP150) yüksek iyonik iletkenlik (47
mS/cm), membran seçimlilik (89 x10⁴ S.s/cm³)  ve yeterli mekanik dayanıma sahip olduğu
görülmüştür. Elde edilen sonuçlar, önce PEGDGE ile kimyasal, sonra ısıl olarak
çapraz bağlanan PVA esaslı anyon değişim membranların Doğrudan Metanol Alkali
Yakıt Hücresi (DMFC) uygulamaları için ümit veren membranlar olarak
düşünülebileceğini göstermiştir.

Anahtar Kelimeler

Polivinil alkol, Yakıt hücresi, Çapraz bağlama

Kaynakça

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